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ADS B 1090Mhz 36DB SMA PCB Antenna inside the antenna integrates a low noise amplifier and filter with RF Bias TEE for SDR|Parts & Accessories| - AliExpress
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cheap sdr , what is this port circled in red for? also this thing is deaf on the 100khz to 30mhz antenna connection , even with a an external antenna. the 25mhz
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ADS B 1090Mhz 36DB SMA PCB Antenna inside the antenna integrates a low noise amplifier and filter with RF Bias TEE for SDR|Parts & Accessories| - AliExpress
![Wendry Radio Antenna, PCB board Mini-Whip MF/HF/VHF/SDR Green Antenna Micro Radio Antenna for Ore Radio and Transistor Radio: Amazon.co.uk: Electronics & Photo Wendry Radio Antenna, PCB board Mini-Whip MF/HF/VHF/SDR Green Antenna Micro Radio Antenna for Ore Radio and Transistor Radio: Amazon.co.uk: Electronics & Photo](https://m.media-amazon.com/images/I/61wY1RMt4SL._AC_SL1001_.jpg)
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